Strain measurement of the quasi-static heterotypic wind turbine blade using OFDR

Abstract

We propose a distributed fiber sensor based on optical frequency domain reflectometry (OFDR) for strain measurement on a wind turbine blade. Due to the varying cross sections along the heterotypic blade, the strain distribution is nonlinearly demonstrated in experiment as estimated and predicted in numerical analysis. Negative strains (compression) and positive strains (tension) are detected in the 177–198 cm and 224–245 cm regions of the fiber, respectively. Moreover, responsivities of −0.775 71 µε/g and 0.599 53 µε/g at 195 cm and 228 cm are proved to be inversely proportional to the local cross sections, with a linearity quantified by R² values of 0.999 87 and 0.999 9. This technique provides an effective method to characterize strain in heterotypic structure, showing potential in defect positioning by stress concentration as well.

Keywords

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